Ultrasound (Cambridge International IGCSE Science)
Exam board Cambridge International · IGCSEUpdated 2025-12-19
Spec point —
P3.4.7
Ultrasound
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The approximate range of frequencies audible to humans is 20 Hz to 20 000 Hz in frequency
- The human hearing range decreases with age
Frequencies of ultrasound
Humans can hear sounds between 20 and 20 000 Hz
- Ultrasound is defined as sound with a frequency higher than 20 kHz
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